[PATCH 08/23] media: i2c: imx258: Add support for 24MHz clock

git
2024-03-27T22:26:27Z

There's no reason why only a clock of 19.2MHz is supported.
Indeed this isn't even a frequency listed in the datasheet.

Add support for 24MHz as well.
The PLL settings result in slightly different link frequencies,
so parameterise those.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Luigi311 <git@luigi311.com>
---
drivers/media/i2c/imx258.c | 133 +++++++++++++++++++++++++++++--------
1 file changed, 107 insertions(+), 26 deletions(-)

diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
index 351add1bc5d5..6ee7de079454 100644
--- a/drivers/media/i2c/imx258.c
+++ b/drivers/media/i2c/imx258.c
@@ -76,9 +76,6 @@
#define REG_CONFIG_MIRROR_FLIP 0x03
#define REG_CONFIG_FLIP_TEST_PATTERN 0x02

-/* Input clock frequency in Hz */
-#define IMX258_INPUT_CLOCK_FREQ 19200000
-
struct imx258_reg {
u16 address;
u8 val;
@@ -115,7 +112,9 @@ struct imx258_mode {
};

/* 4208x3120 needs 1267Mbps/lane, 4 lanes */
-static const struct imx258_reg mipi_data_rate_1267mbps[] = {
+static const struct imx258_reg mipi_1267mbps_19_2mhz[] = {
+ { 0x0136, 0x13 },
+ { 0x0137, 0x33 },
{ 0x0301, 0x05 },
{ 0x0303, 0x02 },
{ 0x0305, 0x03 },
@@ -133,7 +132,29 @@ static const struct imx258_reg mipi_data_rate_1267mbps[] = {
{ 0x0823, 0xCC },
};

-static const struct imx258_reg mipi_data_rate_640mbps[] = {
+static const struct imx258_reg mipi_1272mbps_24mhz[] = {
+ { 0x0136, 0x18 },
+ { 0x0137, 0x00 },
+ { 0x0301, 0x05 },
+ { 0x0303, 0x02 },
+ { 0x0305, 0x04 },
+ { 0x0306, 0x00 },
+ { 0x0307, 0xD4 },
+ { 0x0309, 0x0A },
+ { 0x030B, 0x01 },
+ { 0x030D, 0x02 },
+ { 0x030E, 0x00 },
+ { 0x030F, 0xD8 },
+ { 0x0310, 0x00 },
+ { 0x0820, 0x13 },
+ { 0x0821, 0x4C },
+ { 0x0822, 0xCC },
+ { 0x0823, 0xCC },
+};
+
+static const struct imx258_reg mipi_640mbps_19_2mhz[] = {
+ { 0x0136, 0x13 },
+ { 0x0137, 0x33 },
{ 0x0301, 0x05 },
{ 0x0303, 0x02 },
{ 0x0305, 0x03 },
@@ -151,9 +172,27 @@ static const struct imx258_reg mipi_data_rate_640mbps[] = {
{ 0x0823, 0x00 },
};

+static const struct imx258_reg mipi_642mbps_24mhz[] = {
+ { 0x0136, 0x18 },
+ { 0x0137, 0x00 },
+ { 0x0301, 0x05 },
+ { 0x0303, 0x02 },
+ { 0x0305, 0x04 },
+ { 0x0306, 0x00 },
+ { 0x0307, 0x6B },
+ { 0x0309, 0x0A },
+ { 0x030B, 0x01 },
+ { 0x030D, 0x02 },
+ { 0x030E, 0x00 },
+ { 0x030F, 0xD8 },
+ { 0x0310, 0x00 },
+ { 0x0820, 0x0A },
+ { 0x0821, 0x00 },
+ { 0x0822, 0x00 },
+ { 0x0823, 0x00 },
+};
+
static const struct imx258_reg mode_common_regs[] = {
- { 0x0136, 0x13 },
- { 0x0137, 0x33 },
{ 0x3051, 0x00 },
{ 0x3052, 0x00 },
{ 0x4E21, 0x14 },
@@ -313,10 +352,6 @@ static const char * const imx258_supply_name[] = {

#define IMX258_NUM_SUPPLIES ARRAY_SIZE(imx258_supply_name)

-/* Configurations for supported link frequencies */
-#define IMX258_LINK_FREQ_634MHZ 633600000ULL
-#define IMX258_LINK_FREQ_320MHZ 320000000ULL
-
enum {
IMX258_LINK_FREQ_1267MBPS,
IMX258_LINK_FREQ_640MBPS,
@@ -335,25 +370,55 @@ static u64 link_freq_to_pixel_rate(u64 f)
}

/* Menu items for LINK_FREQ V4L2 control */
-static const s64 link_freq_menu_items[] = {
+/* Configurations for supported link frequencies */
+#define IMX258_LINK_FREQ_634MHZ 633600000ULL
+#define IMX258_LINK_FREQ_320MHZ 320000000ULL
+
+static const s64 link_freq_menu_items_19_2[] = {
IMX258_LINK_FREQ_634MHZ,
IMX258_LINK_FREQ_320MHZ,
};

+/* Configurations for supported link frequencies */
+#define IMX258_LINK_FREQ_636MHZ 636000000ULL
+#define IMX258_LINK_FREQ_321MHZ 321000000ULL
+
+static const s64 link_freq_menu_items_24[] = {
+ IMX258_LINK_FREQ_636MHZ,
+ IMX258_LINK_FREQ_321MHZ,
+};
+
/* Link frequency configs */
-static const struct imx258_link_freq_config link_freq_configs[] = {
+static const struct imx258_link_freq_config link_freq_configs_19_2[] = {
[IMX258_LINK_FREQ_1267MBPS] = {
.pixels_per_line = IMX258_PPL_DEFAULT,
.reg_list = {
- .num_of_regs = ARRAY_SIZE(mipi_data_rate_1267mbps),
- .regs = mipi_data_rate_1267mbps,
+ .num_of_regs = ARRAY_SIZE(mipi_1267mbps_19_2mhz),
+ .regs = mipi_1267mbps_19_2mhz,
}
},
[IMX258_LINK_FREQ_640MBPS] = {
.pixels_per_line = IMX258_PPL_DEFAULT,
.reg_list = {
- .num_of_regs = ARRAY_SIZE(mipi_data_rate_640mbps),
- .regs = mipi_data_rate_640mbps,
+ .num_of_regs = ARRAY_SIZE(mipi_640mbps_19_2mhz),
+ .regs = mipi_640mbps_19_2mhz,
+ }
+ },
+};
+
+static const struct imx258_link_freq_config link_freq_configs_24[] = {
+ [IMX258_LINK_FREQ_1267MBPS] = {
+ .pixels_per_line = IMX258_PPL_DEFAULT,
+ .reg_list = {
+ .num_of_regs = ARRAY_SIZE(mipi_1272mbps_24mhz),
+ .regs = mipi_1272mbps_24mhz,
+ }
+ },
+ [IMX258_LINK_FREQ_640MBPS] = {
+ .pixels_per_line = IMX258_PPL_DEFAULT,
+ .reg_list = {
+ .num_of_regs = ARRAY_SIZE(mipi_642mbps_24mhz),
+ .regs = mipi_642mbps_24mhz,
}
},
};
@@ -410,6 +475,9 @@ struct imx258 {
/* Current mode */
const struct imx258_mode *cur_mode;

+ const struct imx258_link_freq_config *link_freq_configs;
+ const s64 *link_freq_menu_items;
+
/*
* Mutex for serialized access:
* Protect sensor module set pad format and start/stop streaming safely.
@@ -713,7 +781,7 @@ static int imx258_set_pad_format(struct v4l2_subdev *sd,
imx258->cur_mode = mode;
__v4l2_ctrl_s_ctrl(imx258->link_freq, mode->link_freq_index);

- link_freq = link_freq_menu_items[mode->link_freq_index];
+ link_freq = imx258->link_freq_menu_items[mode->link_freq_index];
pixel_rate = link_freq_to_pixel_rate(link_freq);
__v4l2_ctrl_s_ctrl_int64(imx258->pixel_rate, pixel_rate);
/* Update limits and set FPS to default */
@@ -727,7 +795,7 @@ static int imx258_set_pad_format(struct v4l2_subdev *sd,
vblank_def);
__v4l2_ctrl_s_ctrl(imx258->vblank, vblank_def);
h_blank =
- link_freq_configs[mode->link_freq_index].pixels_per_line
+ imx258->link_freq_configs[mode->link_freq_index].pixels_per_line
- imx258->cur_mode->width;
__v4l2_ctrl_modify_range(imx258->hblank, h_blank,
h_blank, 1, h_blank);
@@ -747,7 +815,7 @@ static int imx258_start_streaming(struct imx258 *imx258)

/* Setup PLL */
link_freq_index = imx258->cur_mode->link_freq_index;
- reg_list = &link_freq_configs[link_freq_index].reg_list;
+ reg_list = &imx258->link_freq_configs[link_freq_index].reg_list;
ret = imx258_write_regs(imx258, reg_list->regs, reg_list->num_of_regs);
if (ret) {
dev_err(&client->dev, "%s failed to set plls\n", __func__);
@@ -946,9 +1014,9 @@ static int imx258_init_controls(struct imx258 *imx258)
imx258->link_freq = v4l2_ctrl_new_int_menu(ctrl_hdlr,
&imx258_ctrl_ops,
V4L2_CID_LINK_FREQ,
- ARRAY_SIZE(link_freq_menu_items) - 1,
+ ARRAY_SIZE(link_freq_menu_items_19_2) - 1,
0,
- link_freq_menu_items);
+ imx258->link_freq_menu_items);

if (imx258->link_freq)
imx258->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
@@ -964,8 +1032,10 @@ static int imx258_init_controls(struct imx258 *imx258)
if (vflip)
vflip->flags |= V4L2_CTRL_FLAG_READ_ONLY;

- pixel_rate_max = link_freq_to_pixel_rate(link_freq_menu_items[0]);
- pixel_rate_min = link_freq_to_pixel_rate(link_freq_menu_items[1]);
+ pixel_rate_max =
+ link_freq_to_pixel_rate(imx258->link_freq_menu_items[0]);
+ pixel_rate_min =
+ link_freq_to_pixel_rate(imx258->link_freq_menu_items[1]);
/* By default, PIXEL_RATE is read only */
imx258->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, &imx258_ctrl_ops,
V4L2_CID_PIXEL_RATE,
@@ -1086,8 +1156,19 @@ static int imx258_probe(struct i2c_client *client)
} else {
val = clk_get_rate(imx258->clk);
}
- if (val != IMX258_INPUT_CLOCK_FREQ) {
- dev_err(&client->dev, "input clock frequency not supported\n");
+
+ switch (val) {
+ case 19200000:
+ imx258->link_freq_configs = link_freq_configs_19_2;
+ imx258->link_freq_menu_items = link_freq_menu_items_19_2;
+ break;
+ case 24000000:
+ imx258->link_freq_configs = link_freq_configs_24;
+ imx258->link_freq_menu_items = link_freq_menu_items_24;
+ break;
+ default:
+ dev_err(&client->dev, "input clock frequency of %u not supported\n",
+ val);
return -EINVAL;
}

--
2.42.0